Hi, I am a US citizen and want to travel to Thailand (Pattaya) in Oct, Nov. and Dec. 2009 so I obviously need a 90 day stay but the tourist visa for US citizens is only good for 60 days. Does anybody know how to squeeze another 30 days (extended visa) out of that without flying in and out of the country? Maybe crossing the border down at Pattaya into Cambodia, in and out?

As said above - you extend it 30 days at immigration.

Extend for a further 30 days at Immigration 1,900 Baht fee.

I have removed your other post asking the same question.